Pentax 560mm lens now listed on Adorama...any takers!

Started Nov 5, 2012 | Discussions thread
temama Contributing Member • Posts: 645
Re: Overpriced product - just buy Sigma 500/4.5

I don't KNOW (yet) how good pentax 560mm is optically, but I think - I have a strong belief - that Pentax isn't better optically than Sigma 500/4.5 (at f/5.6-f/8), and Pentax is only marginally longer, but clearly slower lens...I will take rather f/4.5 500mm than f/5.6 560mm tele lens.

For what reason ??

560@5.6 gives the same DoF as 500@f4.5

Yes, but f/4.5 is a bit faster lens than f/5.6

Do you shoot long glass at all ?? as your 'advice' seems way off the mark.

I have old Tamron adaptall 300/2.8 + 1.4x and 2x teleconverters. Tamron is good lens, but manual. I would really like a proper 400/4, 500/4.5 etc AF lens, but at this moment the only options are Pentax DA 300/4 or Sigma 500/4.5... Overpriced Pentax 560/5.6 isn't a valid alternative, too bad.

Sigma 500/4.5 is also modern "compact" telelens design, while Pentax 560/5.6 is slightly comical looking long tube

The only valid argument Sigma Vs Pentax is Price Vs Features which has always been the case with 3rd party glass.

Sigma 500/4.5 is very HQ lens, even if 3rd party glass.

Until the lens is quantified there can be no 'value' argument .


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